[seqfan] Re: Peculiar Continued Fractions
Paul D Hanna
pauldhanna at juno.com
Wed Mar 24 19:23:53 CET 2010
SeqFans,
Here is a related conjecture I just came up with.
Given the formal power series in x:
G(x,y) = exp( Sum_{n>=1} x^n/(n*(y^n+1)) )
then the continued fraction expansion is:
G(x,y) = 1/(1 - f(1,y)*x/(1 - f(2,y)*x/(1 - f(3,y)*x/(1 - f(4,y)*x/(1 - ...)))).
where
f(n,y) = y^(n-1)/((y^(n-1)+1)*(y^n+1)) for n>1 with f(1) = 1/(y+1).
EXAMPLE: Let y=2, then:
G(x,2) = exp( x/3 + x^2/10 + x^3/27 + x^4/68 + x^5/165 +...)
G(x,2) = 1 + 1/3*x + 7/45*x^2 + 31/405*x^3 + 3937/103275*x^4 + 64897/3408075*x^5 +...
G(x,2) = 1/(1 - (1/3)*x/(1 - (2/15)*x/(1 - (4/45)*x/(1 - (8/153)*x/(1 - (16/561)*x/(1 - (32/2145)*x/(1 - ...)))))).
Is there a none-formidable formula for [x^n] G(x,y) in this case?
Paul
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